Use non-GCC specific way to avoid unused warning

Author: winkj

SHTSensor.h

@@ -166,7 +166,7 @@ class SHTSensorDriver
    * Set the sensor accuracy.
    * Returns false if the sensor does not support changing the accuracy
    */
-  virtual bool setAccuracy(__attribute__((unused)) SHTSensor::SHTAccuracy newAccuracy) {
+  virtual bool setAccuracy(SHTSensor::SHTAccuracy /* newAccuracy */) {
     return false;
   }